Portion of a boat ladder



FIG. 1 is a perspective view of a boat ladder showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear side view thereof;

FIG. 5 is a front side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view showing a second embodiment of my new design;

FIG. 9 is a left side view thereof;

FIG. 10 is a right side view thereof;

FIG. 11 is a rear side view thereof;

FIG. 12 is a front side view thereof;

FIG. 13 is a top view thereof; and,

FIG. 14 is a bottom view thereof.

The terms left, right, front and rear, as used herein, are used with reference to the configuration shown in FIG. 5. The broken line showing of various regions in the Figures, including fasteners, fastener receiving apertures, top portion of the pole, bottom step and base assembly, and the unshaded areas there within are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a portion of a boat ladder, as shown and described. 